nostr/damus
1
0
Fork 0
mirror of git://jb55.com/damus synced 2024-10-04 19:00:42 +00:00
Code Issues Packages Projects Releases Wiki Activity

nostrdb/index: add u64_timestamp lmdb comparator

Browse Source 
custom kind+timestamp comparison function. This is used by lmdb to
perform b+ tree searches over the kind+timestamp index.

Signed-off-by: William Casarin <jb55@jb55.com>
This commit is contained in:
William Casarin 2023-11-23 13:19:07 -08:00
parent 0f9d55d4f9
commit 8269ca59cd
1 changed files with 27 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

27
nostrdb/nostrdb.c
View File

@ -127,6 +127,12 @@ struct ndb_tsid {
uint64_t timestamp; uint64_t timestamp;
}; };
// A u64 + timestamp id. Just using this for kinds at the moment.
struct ndb_u64_tsid {
uint64_t u64; // kind, etc
uint64_t timestamp;
};
// Copies only lowercase characters to the destination string and fills the rest with null bytes. // Copies only lowercase characters to the destination string and fills the rest with null bytes.
// `dst` and `src` are pointers to the destination and source strings, respectively. // `dst` and `src` are pointers to the destination and source strings, respectively.
// `n` is the maximum number of characters to copy. // `n` is the maximum number of characters to copy.
@ -753,6 +759,27 @@ static int mdb_cmp_memn(const MDB_val *a, const MDB_val *b) {
return diff ? diff : len_diff<0 ? -1 : len_diff; return diff ? diff : len_diff<0 ? -1 : len_diff;
} }
// custom kind+timestamp comparison function. This is used by lmdb to perform
// b+ tree searches over the kind+timestamp index
static int ndb_u64_tsid_compare(const MDB_val *a, const MDB_val *b)
{
struct ndb_u64_tsid *tsa, *tsb;
tsa = a->mv_data;
tsb = b->mv_data;
if (tsa->u64 < tsb->u64)
return -1;
else if (tsa->u64 > tsb->u64)
return 1;
if (tsa->timestamp < tsb->timestamp)
return -1;
else if (tsa->timestamp > tsb->timestamp)
return 1;
return 0;
}
static int ndb_tsid_compare(const MDB_val *a, const MDB_val *b) static int ndb_tsid_compare(const MDB_val *a, const MDB_val *b)
{ {
struct ndb_tsid *tsa, *tsb; struct ndb_tsid *tsa, *tsb;